Identification of new Mammea coumarins: Four 7,8-annulated relative of the mammea coumarins B/AA, B/AA, and two of the 6-acyl family, B/AA (isomammein) and B/AB - Crombie,L.; Games,D.E.; Haskins,N.J.; Reed,G.F.; Finnegan,R.A.; Merkel,K.E. (Tetrahedron Lett, 1970)